JPS58153625A - Retainer made from synthetic resin - Google Patents

Abstract

PURPOSE:To provide the titled retainer capable of remarkably increasing the bonding strength of welded parts notwithstanding based upon the single-point gate system wherein the volumes are differed between those of the left and right side parts from the diameter line of the retainer passing the gate point. CONSTITUTION:In providing recessed parts 5 on the back surface of annular body 1, the depth H1 of a part or all parts of the recessed parts 5 arranged in the left side part L is made to be deeper than the depth H2 of a part on all parts of the recessed parts 5 arranged in the right side part, while the thickness t1 being made to be thicker than the thickness t2 and the volume of the left side part L is made different from the volume of the right side part R. The speeds filling up the inside of the cavity of synthetic resin material flowing separately left are right and made different from each other and the welded part 4 of synthetic resin material flowing together in the pocket part 2 opposing on the diameter line passing the gate part 3 is biasedly formed by the dimension A to the thicker side t2 between both sides of t1 and t2 in thickness from the diameter line of X-X.

Description

[Detailed Description of the Invention] The invention relates to a synthetic resin retainer KWI for holding an odd number of rolling elements, sprags, etc. in bearings, one side → two sides, etc.
do.

A cage that holds an odd number of rolling elements, sprags, etc. is, for example, as shown in FIG.
are arranged in equal circular layers. (The figure shows a synthetic resin cage holder.) When forming such a cage by injection molding, for example, as shown in fJN2WJK, at the center position of the 4 portions 2 of the f-layers that meet II, It is common to inject a synthetic resin material into the cavity of a mold for molding.

On the other hand, the synthetic resin cage is designed so that the left and right parts of its diameter @ The shape retainer has the same depth (2) of all the recesses 5 formed on the back side thereof, or the wall thicknesses t, v, etc. of each part.

Therefore, when injection molding is performed with the gate 3 facing the above position, the synthetic resin material injected from the gate 3 flows in the circular annular cavity formed in the mold, separating left and right, and forming a diameter @ -X and join together at the center position of the pocket portion 3 opposite to the gate 3 position. This position will now be the weld portion 4. However, the weld part 4
As is clear from urinating No. sg~), this occurs in the thinnest part of the mecket portion 2. Since weld [4] is a joint, it has the weakest strength than other parts, and has the disadvantage of being easily damaged during use. In order to prevent contact, this becomes even more disadvantageous when the bottom thickness t is ll[Il[6. This is particularly the case when manufacturing cages made of synthetic resins containing solid lubricants such as molybdenum disulfide, carbon black, and polytetrafluoroethylene.

In order to eliminate the drawbacks of the single-point gate method and improve the bonding strength of the weld portion 4, a multi-point gate method (gathers F are provided at multiple locations around the circumference) is commonly used. In multi-contact molding where multiple cages are simultaneously molded with one mold, the mold design becomes extremely difficult, the processing becomes extremely troublesome, and the mold structure becomes tangential. This method is inferior to the single-point gate method in terms of workability and economy.

In the synthetic resin retainer as described above, the present invention greatly increases the bonding strength of the weld portion even with a single-point gate method by subjecting the molding die to a certain processing.
It is an object of the present invention to provide a synthetic resin cage that is also highly economical.

To explain an embodiment, in a synthetic resin cage having an odd number of mequette parts 2 on an annular body l, a synthetic resin cage is used for injecting a synthetic resin material into the cavity of a molding die (not shown). The volume is made up of the left side part R and the right part R from the diameter line X-X passing through the 43rd position, and the right part The thickness t of the corresponding part of the page is made different.

4th v! J(IL) l (b) is a diagram showing an example of a case where the above configuration is embodied, and when a hollow part S is provided on the back side of the ring l, a part of the hollow part 5 provided on the left side part B is Alternatively, the entire depth Hl is formed deeper than a part or all of the depth Hl of the recessed part 5 provided in the right side part, and the thickness t is made thicker than the thickness tl. The volume of the right part R is made different from that of the right part R.

Such a structure is obtained by slight processing on the mold for molding the cage, and when injecting the synthetic resin material into the cavity of the mold, it is injected from a single point gate 3. The synthetic resin material flows from the goo 43 position to the left and right, and at this time, the thickness t is changed to the thickness t as described above.
Since K is designed to be thicker than L, the rate at which the synthetic resin material fills the cavity is different due to the fact that it flows separately on the left and right, and the material flows separately on the left and right, and the resin material flows at the 43rd position and at the same position. The weld part 4 of the synthetic resin material, which joins at the l cella 1 part 2 which faces each other on the diameter line passing through, has a thickness tl and t+ from the diameter line XX, as shown in FIG.

It is formed by being biased by a dimension mm toward the thicker side.

The dimension corresponds to the volume ratio of the left side portion to the right side portion, thus eliminating the inconvenience that the weld portion 4 is formed at the thinnest portion of the pocket portion 2 with a thickness t, and reducing the joint area. As a result, the bonding strength of the weld portion 4 increases.

As a means for making the volume different between the left part and the right part R of the diameter MIX-x of the retainer passing through the groove 43 position, as shown in FIG. (t or inner diameter side or outer diameter) K thickness t, I and t
, A portion where I rises may be provided, and in this case, the outer periphery (or inner periphery or inner and outer periphery) of the portion for forming the hollow part of the mold is appropriately eccentric with respect to the inner and outer diameters of the cage. In particular, the purpose of abstraction can be easily achieved.

In this way, when providing parts with different thicknesses in the left part and the right part, the thickness 1 ．． ．． 1. Alternatively, it is necessary to appropriately set the difference between t and 1°t-'.

FIG. 6 and Tuna 7 are diagrams showing still other embodiments,
A lip 6 is provided inside at least one of the hollow portions 5. The position where the lip 6 is provided is in the hollow part outside the diameter 11X-x upper part, and the 6th v! Reply like J6
Yen #! 3 equally spaced, two of them are on the left side of the X-X line, and the other one is on the X-x! If the mold is molded so that it is on the right side of I, the left part R and the right part R
The weld part 4 is made to have a different volume with the diameter line X-
The bonding area can be increased by appropriately deviating to the left (or right) from above X. This Figure 6, lI? The vli embodiment is most suitable when it is necessary to particularly consider rotational balance under conditions such as high speed.

Furthermore, as a substitute for providing the lips 6, protrusions 7 are provided at three equal or appropriate positions on the circumference as shown in @8W, No. 1111iffK, and the portion on the left side from the X-X line is similar to the above. By making the volume of the right portion R different from that of the weld portion 4, it is possible to deviate the weld portion 4 from the diameter line XX, thereby increasing the bonding area. Furthermore, although not shown, the hollow parts 11 and 9 are formed at equal or appropriate positions on circle #I3, and the volumes of the left part and the right part R are made different, so that the weld part 4 has a diameter @X - It can be shifted further to the left (or right).

As described above, in a synthetic resin retainer having an odd number of pockets, a weld part is formed at the thinnest part of the pocket parts facing each other on a diameter line passing through the gate position. This problem can be completely eliminated, the bonding strength of the weld portion can be significantly improved compared to the conventional method, and the service life of the weld can be greatly extended.

Especially in cages with sealed rollers for 9 bearings, where the thickness t at the bottom of the pocket is limited and the cage is thin, severe conditions such as moment loads, insufficient lubrication, and high speed rotation are imposed on the cage. In addition, this invention eliminates inconveniences such as breakage from the weld part even in cases where the weld part is damaged.Ninthly, this invention also prevents the strength of the weld part from decreasing.
Since the purpose of the manufacturing process is achieved using a single-point gage method, there are some problems in mold design when performing multi-cavity molding with multiple molding cavities in one set of molds. It has no defects and is excellent in terms of workability and economy, and it is also possible to significantly reduce costs◎

[Brief explanation of the drawing]

Figure 61 shows the oblique view of a crown-type retainer with an odd number of pockets [
Figures F and @2 are front views, Figures 111 and 3 (荀, 伽) are enlarged side views showing the main parts of an AT-shaped retainer using the conventional single-point gate method, and Figure 4 ( &), (b) is a side development view showing a portion corresponding to Fig. 3 (&) # (1)) of the embodiment of the present invention, and Fig. Figure 7 is the 6th v! Side view l @ figure showing the main part of J in cross section, WIS8 figure is a rear view of another embodiment,
FIG. 9 is a sectional view taken along line IX-IX in FIG. 8. 1... Ring body, 2... Pocket part, 3... Gate,
4... Weld part, 5... Thin part, 6... Lip, F... Protrusion, L... Left side part, R... Right side part Applicant: Koyo Seiko Co., Ltd. Kinsha No. 1 Figure (Q) Figure 2 Violet

Claims (1)

[Claims] (1) In a synthetic resin cage having an odd number of pockets, the diameter of the cage passing through the gate position for injecting the synthetic resin material into the cavity of the molding die. A synthetic resin cage characterized by having a volume that differs between the part on the Chitomo side and the part on the right side of the line (2) The part on the left side and the part on the right side of the diameter line of the cage passing through the gate position. A synthetic resin retainer (3) according to claim (1), wherein a portion with a rising thickness is formed so that the volumes of the left side portion and the right side portion are different. A composition according to claim (1) or (2), in which portions with different depths are provided, and the volumes are made different between the portion on the Chitomo side and the portion on the right side of the diameter line of the cage passing through the gate position. Resin cage (4) A thickened part is provided on the inner diameter side, outer diameter side, or both of the hollow part formed in the cage, and the volume is made different between the left side part and the right side part. Synthetic resin cage (5) according to claim (1) or (2), wherein a 9-pitch is formed in at least one place of the hollow part formed in the cage, and the left part and the right part are connected to each other. Synthetic resin cage (6) according to claim (1) with different volumes; ribs are formed in a plurality of hollow parts formed in the cage, and ribs are formed in the left part and right part of the diameter line. A synthetic resin cage (7) according to claim (1), wherein the number of lips is different and the volumes are different between the left side portion and the right side portion. A synthetic resin retainer (8) according to claim (1), in which projections are formed on the retainer, and the volume thereof is different between the left side and the right side of the -radial line. 1. Eliminate at least one of the gaps in the @certain number. The synthetic resin retainer according to claim (1), wherein the volume of the left side portion and the right side portion of the diameter line are different.